Is your heart right? Then be humble and watchful. You are not yet in heaven, but in the world. You are in the body. The devil is near you, and never sleeps. Oh, keep your heart with all diligence! Watch and pray lest you fall into temptation. Ask Christ Himself to keep your heart for you. Ask Him to dwell in it, and reign in it, and garrison it, and to put down every enemy under His feet.
~ J.C. Ryle
Old Paths, “The Heart”, [Carlisle, PA: Banner of Truth, 1999], 356.